KPSS 2014 Soru=25

(I) In teaching process, a common misconception is that
teaching content is less important than teaching critical
thinking skills or problem-solving strategies. (II) Studies
have shown that highlighting and re-reading text is
among the least effective ways for students to
remember the content of what they have read. (III) A far
better technique is for students to quiz themselves.
(IV) In one study, students who read a text once and
then tried to recall it on three occasions scored 50
percent higher on exams than students who read the
text three times. (V) And yet, many teachers persist in
encouraging the techniques that science has proved to
fall short.

Which of the sentences in the given paragraph is
irrelevant, violating its unity and coherence?